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No. 770,529. I PATENTED SEPT. 20, 1904.

' W. L. LEVY & C. DRESSLER. v

DISPLAY DEVICE FOR ELECTRIC LAMPS.

APPLICATION FILED DEOA, 1903.

N0 MODEL. 3 SHEETS-SHEET 1.

WITNESSES: I INVENTOR! I IATTOHNEYJ'.

PATENTED SEBT. 20,.1604

3 SHEETS-SHEET 2 INVENTOR! K Jaws.

. ATTORNEYS Ink-ll:

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W. L. LEVY & G. E. DRESSLER. DISPLAY DEVICE FOR ELECTRIC LAMPS.

APPLIOATIOH FILED DEO.4, 1903.

N0 MODEE.

WITNESSES:

N0.770,529. PATENTED sBPT.20, 1904.

' W.'L. LBVY& 0;5. DRESSLER. v

DISPLAY DEVICE FOR ELECTRIC LAMPS.

APPLICATION FILED 1120.4. 1903 ssnzms-snnm a Arromvn NO MODEL.

Patented September 20, 1904.

UNITED STATES PATENT OFFICE.

' WILLIAM L. LEVY AND CHARLES E. DRESSLER, OF NEW YORK, N. Y.; SAID DRESSLER ASSIGNOR TO SAID LEVY.

DISPLAY DEVICE FOR ELECTRIC LAMPS- SPECIFICATION forming part of Letters Patent No. 770,529, dated September 20, 1904. Application filed December 4, 1903. Serial No. 183,736. (No model.)

To all whom it may concern:

Be it known that we, WILLIAM L. LEVY and CHARLES E. DRESSLER, of the city, county, and State of New York, have invented a Display Device for Electric Lamps, of which the following is a specification.

This invention relates to an arrangement in electric lamps which results in the formation of shadowgraphs by attaching signs to pins or plates on a'revolving ring or diaphragm. The accompanying drawings will serve to make clear the device which accomplishes this result.

Figure 1 is an elevation of the mechanism adjusted for an arc-light. Fig. 2 is an elevation of the same viewed from left side of Fig. 1. Fig. 3 is a plan view in section taken through on w of Fig. 2. Figs. 4 and 5 are detailed views of the means for controlling the periodic revolutions. Fig. 6 is an elevation lshowing the parts within the globe of an arcight.

To the frame A of an electric-arc lamp is detachably mounted by screw-clamping devices t b a ring 0, which is grooved on its upper surface for the reception of a number of steel balls acting as a ball-bearing for the toothed ring 0, similarly grooved on its bottom, whereby the friction is reduced to a minimum. Said toothed ring 0 meshes or gears with a pinion d, supported by the hingedbearing d. On the same shaft with the pinion d, but on its opposite end, is

mounted or fitted a bevel-gear e, which is rotated by a similar bevel-gear e, fastened to a worm-wheel f, whose connecting or driving worm-screw f is an extension of the shaft of a small electric motor g, suitably mounted by screws, &c., to the ring 0. Said electric mo-' tor is the source of power which rotates the ring 0, upon which upright pins 1 2 3, &c., or plates similar to 4 are mounted for the purpose of forming shadowgraphs when any writings, letters, or signs are fastened to said pins, and thus interposed between the light of the arc and the globe. Small angle-pieces h are fastened to the inner side of ring 0 in order to guide ring 0' upon the steel balls,

thereby giving it a steady motion and preventing its displacement.

On the same shaft with the worm-wheel f is a Worm-screw c, which engages the wormwheel c", and on the same shaft with the latter is fastened a disk 70, provided with an arm k,which once every revolution lifts up the lever Z. Said lever Z is pivoted to Z, and on the same pivot, but not fastened to it, swings a bracket m, with a socket at m and an adjusting-screw at m The bracket m and the swinging or hinged bracket d are united by a bar 71/, whose turned-down ends fit loosely into the socket m at the one side and into the loop 07. at the other end. The object of the however, as the arm k has passed the thickened part of lever Z the pinion (Z will then again be pushed and held out of gear by the spring (Z and the ring 0 remains stationary.

-In order to revent the ring 0 from movin 2:

of its own accord by vibrations or swinging of the arc-lamp, a spring 0 is adjustably mounted by a bracket p to the ring 0 and so arranged that its curved end fits between two teeth of ring 0' and exerts a slight pressure. 4 As shown in Fig. 6, an electrical resistance 9 is located within the inclosure of the arcregulator above the globe for the purpose of introducing in series with it a resistance into the circuit for the electric motor the connections of which are made in multiple with the same wires feeding the electric are; but said resistance q prevents the electric current from entering the motor too strong, and thusavoids sparking at the motors commutator.

The object of having two sets of Wormwheels is to obtain a time difference in the movement of ring 0, which is supposed to move quickly from space to space'say onequarter or one-eighth, &c., of its circumferenceand the stop for one, two, or more minutes before ring 0 begins again to rotate an other space, thus giving observers-time to see and study the display signs projected against the globe or beyond it against surrounding objects, such as screens, houses, &c. The time interval can be adjusted (id lib 5mm by placing one or more arms similar to 7: on the circumference of the disk 7:, thereby reducing the intervals between each move of the ring 0, or said intervals may be increased by increasing the diameter of the worm- Wheel a. g

The foregoing description shows the special adaptation of the device to an arc-lamp; but it may similarly be applied to any electric light.

Having thusdescribed our invention, what we desire to claim and secure by Letters Patent is- 1. In a display device for electric lamps, a revolving ring grooved on its lower surface, balls acting as a ball-bearing for said ring, a stationary ring holding said balls; an electric motor and means for rotating the moving ring, signs attached to said moving ring, substantially as described.

2. In a display device for electric lamps, a revolving ring grooved on its lower surface, ballsacting as a ball-bearing for said ring, a

stationary ring holding said halls, an electric motor and means for rotating the moving ring, signs attached to said moving ring, means for guiding the moving ring on the stationary ring and adapted to give it a steady motion and preventing its displacement, substantially as described.

3. In a display device for electric lamps, a revolving ring grooved on its lower surface, balls acting as a ball-bearing for said ring, a stationary ring holding said balls, signs attached to said moving ring, means for guiding the moving ring on the stationary ring and adapted to give it a steady motion and preventing its displacement, and means for periodically controlling the revolution of the moving ring, substantially as described.

In testimony whereof we have hereunto set our hands, this 1st day of December, 1903, in the presence of two witnesses.

l LLIA h l I1. LEVY. CHAS. E. DRESSLER.

\Vitnesses:

A. M. Lowmmc, Tnos. SMITH. 

